Iterative solutions of MFIE for computing electromagnetic scattering of large open-ended cavities

The analysis of high-frequency scattering from electrically large open cavities is addressed in the paper. A magnetic-field integral equation (MFIE) for the equivalent currents on the interior cavity walls is obtained and solved by two different algorithms based on high-frequency principles of physical optics (PO). currents are known, Once the currents are known, the scattered field are obtained by using aperture integration (Al) in the cavity mouth, or a reciprocity integral (RI) over a surface close to the termination. Numerical results are presented which demonstrate the accuracy of the proposed convergence and accuracy of the proposed methods, by comparison with modal reference solution.